graphql-ld-sparqlendpoint
Version:
A GraphQL-LD engine that is backed by a SPARQL endpoint
36 lines • 1.95 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.QueryEngineSparqlEndpoint = void 0;
const fetch_sparql_endpoint_1 = require("fetch-sparql-endpoint");
const sparqlalgebrajs_1 = require("sparqlalgebrajs");
const stringifyStream = require("stream-to-string");
/**
* Allows a SPARQL endpoint to be used by URL as a GraphQL-LD query engine.
*/
class QueryEngineSparqlEndpoint {
constructor(url, fetcherOptions) {
this.fetcher = new fetch_sparql_endpoint_1.SparqlEndpointFetcher(fetcherOptions);
this.url = url;
}
query(query, options) {
return __awaiter(this, void 0, void 0, function* () {
const queryString = sparqlalgebrajs_1.toSparql(query);
const responseStream = (yield this.fetcher.fetchRawStream(this.url, queryString, fetch_sparql_endpoint_1.SparqlEndpointFetcher.CONTENTTYPE_SPARQL_JSON))[1];
let output = yield stringifyStream(responseStream);
// Replace invalid JSON characters, which can occur for some endpoints.
output = output.replace(/\x1a/g, ' ');
return JSON.parse(output);
});
}
}
exports.QueryEngineSparqlEndpoint = QueryEngineSparqlEndpoint;
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